Sewing machine



FIGJIQK Oct. 9, 1945'. n

G. sAUER SEWING MACHINE,

Filed Nov. 9,'. 1942 Sheets-Shet 2 oct.' 9, 1945.

Filed Nov. 9, 1942 ca.y sAuER SEWING MACHINE 6 sheets-sheet s' f liI Ilk=== Fmg l nngmnf mum-m imm I {lllll 1 Iil IN VEN TOR. GEORGE 654051?ATTORNEY f G. sAUER 9 SEWING MACHNE.

- Oct. 9, 1945.

6 Sheets-Sheet 4 Filed NOV. 9, 1942 i L IHWWWIWHN llu| mm, v w nl a o,11. m, h R QQN I n m2 Oct. 9,1945. G. SAUER I SEWING MACHINE l ed Nov.9, 1942 6 Sheets-Sheet 5 Patented @et 9, y1945 meer@ iiNlrED STATES.PATENT'oFFlcl-z l aaaasie' l n SEWING MACHINE George Sauer, Chicago,Ill., assigner to Union Special Machine Com poration of Illinois pany,Chicago, Ill., a co1'- Application4 November 9, 1942, SerialNo, 464,954

c claims. (ci. i12-256) This invention relates to sewing machines of thelockstitch type and moreparticularly to prov visions for lubricating theraceway of a vertical asis hook. or a plurality of such hooks,.and forlubricating and supporting associated devices.

K A primary object of the invention has been to provide a particularlysimple construction of the character indicated which is readilyaccessible for inspection, filling and repair, is adapted to supply thelubricant to the raceway at a substantially uniform rate regardless ofthe amount of oil available in a reservoir, forming part of the system,is readily regulatable as to rate of oil flow, and has various otheradvantages, to be hereinafter pointed out. y

More specically,'an object of the invention has been to provide arelatively large reservoir for oil intended expressly for thelubrication of the raceway and other surfaces'associated with a verticalaxis rotary hook, the construction and arrangement being such that therateof ow of the oil to the raceway is affected to a minimum extent byvariations in head resulting from theA constantly,d changing amount ofoil in the reservoir. This has been accomplished by locating thereservoirgat a point remote from thehook and at an elevationsubstantially above that of ple means for enabling adjustment of thehook or hooks transversely of the direction of feed. The lubricantconducting connections from the reservoir to the hook raceways are suchas to enable this adjustment. They are suchl furthermore, as to avoid'all danger of leakage of the lubricant resulting from relativeadjustment of the parts.

There are numerous special features of the construction which tendtoward simplicity in the lubricant to various other surfaces on the hookassembly requiring lubrication, as, for ex'- `ample, to the` bearingsfor the hook shaft and to the raceway and other surfaces to belubricated.

Another specific object has been to provide, in a lubrication system ofthe character indicated, simple, eilective and readily accessible reg-fulating means for controlling the amount of lubricant to be delivered tothe hook raceway, depending upon the requirements of a particularmachine. This regulating means is such, morecertain escapement devices.f

Another special feature is a particularly advantageous arrangement ofthe escapement mechanism associated with each rotary hook; This isdisposed in an enclosed chamber in the-bottom of the hook saddle orframe, thereby enabling the retention of a quantity l,of the lubricantabout over, that the supply of oil to each of a plurality` l of hooksfrom a single reservoirmay be eil'ectively controlled;

A further specific object has been to provide, in combination with theindividual flow regulating means for a plurality of hooks, a main flowcontrol means which is conveniently located and may ,be readily andvquickly operated to Irender the lubrication system eilectiveorineilective at will. i Still another -object'has been to 'so constructand arrange the connections between the reservoir and the hook racewaysas to prevent, or reduce to a minimum, the danger of trapping airbubbles and thus interfering with the operation of the system. TowardAthis end a portion of the duct system leading downwardly from thereservoir has been disposed substantially vertically so some of themoving parts of' the mechanism, the

, latter being conveniently operated by connections from the lower lendof the hook shaft. The arrangement is such, moreover, as to facilitateremoval and replacement of certain exposed parts\ of the escapementmechanism and to permitiadjustnient or replacement of such parts withoutcompletely dismantling the escapement mechanism or removing theenclosure for the othe parts of the mechanism.

Other Nobjects, `features and -advantages ofy the invention will appearfrom the detailed description -of an illustrative form of the samefwhich'will nowbe given in conjunction with the that anytrapped air`will rise freely and escape into the reservoir. a

A still further object has been to provide simaccompanying drawings;-folining part 0f the speciiicatiomin which:

Fig. I i's a view partly in side elevation and partly in verticalsection through a machine embodying theinvention, a portion of theoverhanging arm of the machine being shown in broken lines to avoidunnecessary details.'

Fig. II is a somewhat enlarged view, in plan, oi the work supportingportion of the machine with certain cover plates removed to show thehook units beneath.

Fig. III is a bottom plan view of the machine with a cover plate at thebase of the standard removed to disclose certain parts 'enclosed therefby.

Fig. IV is a transverse, vertical section along the line IV-IV of Fig.I.

Fig. V is a--plan view, along the line V-V ofA Fig. I, showing a portionof the,top of the machine. p

Fig. VI is an enlarged sectional view along the line VI--VI of Fig. IV.

Fig. VII is a transverse, vertical section through the base of themachine, along the line VII-VII of Fig. II.

Fig. VIII is a vertical section through one of the hook units as viewedalong the line VIII- system.

Fig. XII is a vertical section along the broken line XII-XII 0f Fig'.XI,

Fig. XIII is a bottom view of one `of the hook frames with its `bottomplate removed, as indicated by-the line `XIII-X111 of Fig. VIII, andFig. XLVis a top plan view of said hook frame with a portion of theframe broken away for' purposes of better illustration.

'I'he invention has been` illustrated herein as applied to a lockstitchsewing machine of the type disclosed in the pending application of OscarQuist, Ser. No. 326,828, led March 30, 1940, and now matured 'intoPatent No. 2,329,484,`dated September 14, 1943. It will be understood,however, that the invention is intended for, or susceptible of,application to other types ofvvertical axis rotary hook machines havingany desired number of needles `and rotary hooks and having other formsof work feeding mechanism and the like. Y

Referringnow to the drawings, the machine may suitably be provided witha frame having a base portion I0, the upper surface of which constitutesa work support.; At one end of the base there is providedanupwardlyextending hollow standard Il at the upper end of which iscarried a laterally projecting hollow arm I 2 which extends over thework support and' terminates in a needle head portion I3. Journaled insuitciprocated in a "substantially vertical direction, upon eachrevolution of the shaft I4, but is also oscillated to swing its lowerend in the direction of feed. This swinging movement' may be of 'anyselected, variable magnitude and is for the purpose of assisting inthefeeding of the work. However, the needle feed action may be eliminated,if desired. Also mounted in the needle head is a spring-urged presserbar I8 carrying a presser foot I9, of any suitable construction, at itslower end. Any convenient means may be employed for urging the presserbar downwardly, to retain the presser foot yieldingly in engagement withthe work, and for disabling the presser ber 23 having an arm connectedby a link 24` with an arm 25 secured to arock shaft'26 which extendslengthwise of the base I0 and is journaled in suitable bearings providedthereon. A feed rocker arm- 21 (Fig. III), ,secured to the shaft 26,carries at its upper end a feed bar 28 having mounted thereon the feed dog 20. This mechanism for imparting the feed and return movements to thefeed dog may suitably be interconnected, by means of the rock member 23,with the devices for imparting the feed movement to the needles I1, asmore fully explained in the above-mentioned Quist application. Thelength of thefeed stroke of both the needles and the feed dog may bevaried by adjustment of the.

bar 23 through rotation of a, thumb screw 30. Lifting and lowering of4the vfeed dog may be accomplished through other connections,V with theshaft I4, including a gear 3|, secured to the shaft and arranged todrive a,transmittinggear -32 mounted on a horizontally disposed shaft 33in the standard II,. which is in turn adapted to drivea gear 34 securedto a shaft 35. The latter is mounted for rotation ,in suitab-le bearingsin `an eccentric secured the base-of the machine. Gears 3l and 34 are ofidentical constructionso that ftheshaft .35 will be givenone revolutionfor each revolution of the shaft I4. Suitable connections, including toYthe shaft 35 and cooperating with a strap member 36 pivotally connectedwith a. downwardly extending arm'31 of the feed bar, serves to impartthe lifting and lowering able bearings, provided in the upper portion ofthe standard I I and in the overhanging arm I2, is

a main drive shaft I4 having at its outer end, beyond the outer wall ofthe standard, a combined hand wheel and pulley I5` by .means of whichpower is supplied to the machine.

Suitable connections are provided from the shaft Il for operatinganeedlebar I6 appropri- The.

movements to the feed dog, all as more fully set forth in said Quistapplication.

The shaft 35 also serves to operate the rotary l hooks which aredesignated generally at 38 and 39 in Fig. II. For this purpose there issecured to the shaft 35 at. the appropriate points a pair of spiralgears 4U (Figs. I and III) adapted to mesh with spiral pinions 4Isecured to shafts 42,

which shafts support and drive, and form integral lparts of, the rotary.components of the hooks.

Therelation between 4the gears 40 and pinions -l is such that the hookshafts will be giventwo revolutions for each revolution of .the shaft35.

`For this purpose onel the under surface of the main body 56 of the yrotary component of the hook. A needle guard gated slot 44 adapted -toreceive a screw 45- threaded into av lug 46 extending downwardly fromthe work supporting portion of the base. The opposite end of the saddleis forked, as indicated at 41 (Fig. VII). vand is adapted to be clamped,by means of a screw 48, about a bear-'- ing sleeve 49 (Fig. III) inwhich the shaft 35 is journaled.` By loosening the screws 45 and 48,

the' hook frame may be shifted longitudinally of the basegi. e.,transverse to the line of feed of thework. This permits avariation inthe spacing of the needles in a multiple needle machine and permitsadjustment of the rotary hook with respect to its cooperating needle ineither a sin- 'gle orwmultiple hook machine. When the hook frame isadjusted in the manner indicated, the

associated driving gear 40 will also need to be adjusted and for thispurpose it is simply necessary to loosen a set-screw 50 which securesthe driving gear to the shaft 35.

The hook shaft 42 is journaled at its lower end in a 'bushing 5I,carried by a portion 52 of the frame, and it is journaled at its upperend in "a bearing 53, mounted in `a. portion 54 of the frame The drivingpinion 4I secured to the hook shaft isdisposed between the two portions52 and 54 of the frame and is fitted snugly between -the two bearingsleeves 5l and l53 which take the end thrusts of the shaft.' At itsupper end the shaft 42 is flared outwardly to provide a frusta-conicalsection 55 which extends into the mainy body 56 of the rotatingcomponent of the hook. The shaft 42, section 55, and main g body 56 arepreferably formed as an integral unit, although they may be formed intwo `or more separate parts, if desired. Within the usual cavity inrthe.top of the hook body there is disv (Figs. II, VII and VIII) may besecured to the` hook by a plate portion inserted between the plate 68and the main body 56. I'I'he inner, annular surface 1| of the'plate 68is of frustolconical form, confonnmg with that of the secun 55-of thehook but spaced slightly therefrom, so

as to provide a small annular channel, for the passage of the lubricant,in continuation of that formed at ,the upper end of the sleeve 53. Thedownwardly projecting portion 61 is formed, also,

- .with anouter'frusto-conical surface 1'2, inclined in the opposite,direction from the surface ll. Surface 12 is spaced slightly from acorresponding frusto-conical surface 13 formed at the inner edge oftheenlarged portion of .the opening 66 in the plate 65, and serves to slingor impel downposed a stationary bobbin carrier 51 which is held ,againstrotation with the rotary component, by appropriate means of well knownconstruction. The bobbin carrier is provided with an interrupted rib 58adapted to cooperate with a raceway 59 formed in the wall o f the rotaryi component 56. It isthe lubrication of this raceway which constitutesan important purpose of the present invention. f

Referring now to Figs. VII to X, inclusive,

- means, to be hereinafter described, are provided -wardly, duringrotation of the hook, any oil which reaches thev surface 12. Dne or moresmall outlet ports 14 extending through the bottom of the main body 56of the hook serve to deliver oil from the channel between the surfacesand 1| to the interior of the hook body.

It will be apparent that oil delivered to the'A I recess 6I and throughthe passage 63 to the surface' 55 will, upon rotation of the rotarycom-- I ponent of the hook, be distributed upwardly and outwardly alongthis surface by centrifugal aetion and will be forced through thepassage 14 to the interior of the `rotary component and thence tothevraceway 59. Any oil whichl tends formed in the inner surface of thebushing 53v permits some of the lubricant to pass downwardly along theouter surface of the shaft to lubricate the upper bearing and the teethof the driving gears. this lubricant will be forced upwardly by theviscous pump action of the spiral'groove so as to prevent objectionalleakage of the lubricant from vthe base of the bushing.

Each hook unitl is provided'with an escapement mechanism adapted tofunction in a well known manner. This mechanism may comprise a finger.16 (Fig. II) oscillated upon each cycle with a recess 6l at one side ofthe hook bracket or frame 43. A passage 63 in the frame places therecess 6I 'in communication with a notch 64 in the upper end of thebearing sleeve 53.` On its inner. surface, the upper end of this bearingsleeve is flared outwardly to conform with the frustoconical section 55of the hook shaft but it is spaced slightly yfrom the latter to providean annular channelv for the flow of the lubricant along the surface ofthis frusto-conical section. At the top ofthe main body of the hookframe, there is'secured a plate 65 which closes theK top ofla portion ofthe passagev63. This plate is provided .with an annular opening 66'surrounding the upper end of the bushing 53. Above the end of tion ofthe frusto-conical section 55. Into this,

pocket extends a downwardly vprojecting portion,

61 of an annular plate 68 secured by screws 68 to of operation of themachine to carry it's end into engagement with a projection 11 on thebobbin carrier for-the purpose of turning the latter slightly againstthe frictional drag of the rotary hook. This is to permitthe thread loopto bev released from the usual projection on the stationary component ofthe hook which normally holds the latter against rotation. Finger 16 isadjustably lcarried by an arm 18 by means of an elongatedslotlil in thefinger and a retaining screw lll).v The arm 18 is secured by means of alclamping screw 8l to the upper end of a rock shaft or pin 82. Thelatteris vertically disposed (Fig. IX) in a hole 8 3 which extends verticallythrough the hook saddle and forms a bearing'for the rock shaft. Atthelower end of the rock shaft there is secured a two-armed member 84, ofbellcrank shape,v having pivotally attached thereto, at its elbow, oneend of a pitman whose opposite end is .apertured to form a strapcooperating withan eccentrie provided at the lower end of the hook shaft42. The arm 81 of thememb'er However, during rotation of the shaft,v

84 extends beneath the pitman 88 and serves to retain the latter inproper engagement with the eccentric 86. In the assembly of these parts,after the pitman 85 has been applied to the* eccentric, the member 84 israised with the rock shaft 82 l tothe proper position, at the same timeengaging the bearing aperture in the arm 84 with the pivot pin 88, whichhas a tight t in the pitman. Arm 18 is then pressed downwardly over theshaft82 until the bottom ofits forked end engages the top plate 65 ofthe hook unit and it is there clamped in position. During thisadjustment of the arm 18 the shaft 82 is held raised in its proper iposition by means of pliers which may conveniently be engaged with atongue 89 extending upwardly from the end of the shaft.82 above thesurface of the arm 18. As best shownvin Figs. VII, VIII andl IX, the

escapement operating members 84 and 85 are disf posed in an L-shapedchamber or recess 90 provided inthe bottom of the frame 43, this chamberbeing closed byv a plate 9| and a gasket 9 2 'secured by screws 93 tothe bottom of the frame.

A passage 63a (Fig. XIV) vformed through a portion of the framecommunicates at one end with cant continuously, as required, tothe`tting 68 of each hook unit of the machine. Referring .to Figs. I, I Vand VI, there is provided at the topof the vertical standard arelatively largelubricant reservoir 94. This may suitably be formed ofsheet metal, or an appropriate plastic or the like, and provided with aflange 95 adaptedto be clamped between a fiat surface 96 provided at thetop of the standard. I I and the under surface of a cap or closure`member 91 which is secured by screws 98 to the top of the standard.Suitable gaskets 9 9 may be provided above and below the flange toinsure a tight seal. In order'to provide maximum lubricant capacity at asubstantial elevatio'n above the work support, the reservoir may, intransverse cross section, have an L-shaped configuration, as illustratedin Fig. IV. -The reserl voir may be filled with the desired lubricantthrough an opening |88 in the closure member the oil passage 63 and atits opposite end with the l interior of the hole 83. In this way, aportion of the oil delivered through the fitting 68 is suppliedto thebearingfor the rock shaft 82.` This oil, descending along the rockshaft, enters and may eventually fill the chamber 98 at the base of thehook frame-or, if this is otherwise lled, it

will be kept constantly replenished. Thus, all of the relatively movingparts `of the escapement mechanism will be thoroughly lubricated.Moreover, some of the oil from the chamber 98 will .work upwardly intothe bearing 5| and thus 98 and serving in part to lubricate the escape.

ment 'mechanism and the lower bearing for the hook shaft. f

By reference to Figs. VIII and XIII, it will be noted that theconstruction and arrangement of the escapement mechanism and other partsassociated with the hook shaft is such that the latter may be readilyremovedand re-inserted through the top of the hook frame withoutremoving the plate 9| which closes the recess.98. To remove the shaft,it is simply necessary to loosen the setscrew which retains the pinion4| 'and thefshaft may then be lifted out. The connection between 91,this opening being normally closed by Va spring cap. A gauge of anysuitable type is preferably provided to indicate readily and at alltimes the extent to which the reservoir is filled. A plug |8|, formed ofLucite or similar material, extending through the closure member 91 andhaving its lower. end of tapered or wedge-shaped construction mayadvantageously be employed for this purpose. The construction andoperation of such a gauge is more fully' disclosed and is claimed in myapplication Ser. No. 337,499, filed on May 27, 1940, and issued asPatent No. 2,301,460 onl November 10, 1942.

The lubricant may be discharged from the reservoir 9| through anapertured fitting |82, preferably extending through the'bottom of thereservoir at its lowest point. Thisfitting, which constitutes a valvedoutlet port, has a screw-.threaded neck |83' extending through anopening in the reservoir bottom and is clamped in place by a nut |84. 'Agasket |85 between the underside of the reservoirand a shoulder on thefitting serves to preventleakage of the .oil around the tting; At

its lower end the member |82 is connected with a tube or conduit |88formed of any suitable malterial, such as brass or a plastic compositionor the like, this conduit being attached to the fitting by means of asuitable'coupiing |81. Fora considerable distance downwardly from thereservoir the conduit |86 is disposed in a substantially verticalposition and is free from sharp bends. This insures the ready escape ofany air bubbles which may become trapped .in the conduit. Such air theeccentric 86 and the strap portion of' the fpitman 85 permits readydisengagement and reeng'agement, for this purpose. Furthermore, thelower end. of the eccentric 89 is tapered slightly or beveled, as shownin Figs. VIIand VIII. to facilitate its introduction into the opening inthe pitman 85; As `will be Iseen in Fig. XIII, the recess 98 is of suchnarrow dimension that the pitman 85, when disconnected from theeccentric, cannot be displaced very farfrom its normal path of movement,so that the beveled end ofthe eccentric 'may always be readilyinsertedin the strap opening. Moreover, the relation between ,the opening 66, inthe plate 85, and the portion 81,

of plate 88, is such as to permit the indicated l bubbles will riselfreely through the vertical tubing and be released into thereservoir.At its lower end the conduit has a portion |88 which is curved over asweeping arc and carries at its terminal a coupling |89 adapted `toreceive the Ascrew-- threaded end of a tube ||8 which passes through avertical wall forming a downward extension of the inner wall of thestandard Tube H8 forms part of a manifold member ||2 which, as bestshown in Figs. XI a'nd XII, is provided with a passage ||3 adapted todeliver the lubricant into a cross channel 4. This, to facilitatemanufacture, is closed at one end by av removable screw plug ||5. Smallports ||6 extend downwardly from the cross channel H4 and communicatewith separate vchannels Informed in" related channel H1, a suitablevalve is provided.` Each of these valves comprises an adjustablescrew-threaded plug H8 having a conical .point ||8 at its inner endadapted to close the port with the channels ||1 H6 to any'desiredextent. The plug may be retained in any desired position by means of alock nut |20.' In each of the extensions provided there is inserted anipple |2| adapted, to be connected by a coupling |22 with a conduit|23. The conduits |23 are connected with the respective fittings 60,above'described,` associated with the two hook frames.

Each of the-conduits |23 is provided with a large gthrough the closuremember 91 and is provided at its upper end with a suitable knob |21. Aspring |20, acting between the under surface of the closure 91 and a,washer |29 carried by the valve stem, urges the latter downwardly.` Apin |30 extending through the valve stem, adjacent its lower .endcooperates with the upper end of the fitting |02 and may either engagethe main flat portionof the top of this member or may register with apair vof V-notches |3| formed in the rim of the member. When the valvelstem is in the position indicated in Fig. VI, in which the pin |30registers with the notches |3I, the valve |25 is seated and the ow oflubricant into the conduit |06'is cut olf. However,` if the valve stemis rotated through 'a small angle, it will be cammed upwardly,as aresult of the pin |30 riding up the sides of the lV-notches and onto thenat portion of the top of member |02, thereby opening the valve andpermitting the flow of lu-v bricant into the conduit |06. The knob|21may suitably be formed with a rib |32 or some other indicating meansV toshowwhether the valve is closed or open.

The lower end of the standard (Fig. I) is preferably closed by a bottomplate |33 and a gasket |34 to provide a lubricant chamber serving as a,reservoir for a suitable lubricant for the various bearing surfaceswithin the standard and. if desired, in other parts of the machine also.The gear 34, secured to the shaft 35, may be arranged to dipinto thelubricant in this chamber and disperse it throughout the standard. Thelubricant may also be dispersed to a certain extent by the rocking ofthearm 25. A gauge |35, having its upper end flush with thetop of the worksupporting surface, adjacent the standard, and which may suitably be ofthe type disclosed in the above-mentioned Sauer application, may beprovided to show at all times the levelof the lubricant within thechamber.

The operation of 'the machine is believed to be clear from theforegoing. A biefrsum, how` ever, willnow be given. Periodically, sayonce or several times a day, depending upon the exasaasaa ever themachine is idle, the valve will be closed by positioning the indicator|32 on the knob |21 in the direction shown in Fig. V. When it is desiredto start the machine after an idle period, Athe knob |21 is rotatedslightly, through about -90, to carry the pin |30 out of the V notches|3| 'and onto the atvupper surface at the top of the fitting |02. Thiswill permit the flow of oil from the reservoir through the conduit |06tothe manifold ||2. From thetransverse channel I4 of the latter aportion will pass through each of the vertical ports H5. The rate of o'wthrough these portsshould be suitably regulated, by proper adjustment ofthe screw plugs H8, so that just the right amount of oil .to supply thelubrication requirements of the vertical hooks will be delivered to thelatter. A portion of this lubricant will be passed through the channel63 and the opening 64 to the frustoyconical surface 55, at the upper endof the hook shaft, and upon rotation of the latter will be forcedupwardly and outwardly by centrifugal action and delivered through thepassage 14 to the interior of the hook and thence to the raceway. Whenthe rotary hook is stationary, between the formation of successive seamsor lines of stitching, the oil will simply accumulate in the smallclearance space `around the conical surface 55 and in the small pocketin the top of plate 65. It will be understood that during these briefidle periods of the hooks, the valve |25 will be left open. However, theflow of oil will not be sulcient at these times to cause any substantialloss `of lubricant around the depending portion of the plate 68. Thefrusto-conical surface 12 of the latter will, during rotation of thehook,

serve tothrow or impel the oil downwardly into kthe small pocket andfrom the latter intofthe tentof use of the machine, la suitablelubricant, preferably of a light, stainless type, is introduced throughthe filling opening |00 into the reservoir 94 until the transverseindicating line onr the wall of the standard for this purpose.Whenpassages communicating with the raceway. This not only prevents theescape of the lubricant d uring the periods of operation but alsoprovides space for the subsequent accumulation of oildur-4 ing idleperiods. A-part of the voil delivered to the surface 55 will descendthrough the spiral groove 1-5 into the bearing 53 and provide adein anyway, the conduits which quate lubrication of the latter. Some of thisoil y will nd its way even to the teeth of the gear 4|. -Duringrot'ation of the hook shaft, however,

there is a tendency to impel the oil upwardly within the bushing 53, duetothe vsense of the spiral groove 15, so that no appreciable amount ofoil will escape from the bushing. Another part i of the oil delivered tothe recess 6| in the hook l frame will be diverted through the passage63a tothe bearing aperture 03 in which the rock shaft 82 is mounted.Thus, this rock shai't` is adequately lubricated and any excesslubricant descending along the shaft is delivered into, thev smallL-shapedchamber at the bottom of the hook frame. This oil will serve tolubricate'the operating linkage for the escapement mechanism, includingthe eccentric 86. oil will 'also und its way into the bearing sleeve 5Ito lubricate the lower end of the hook shaft 42.

Sl-ould it be desired-'for anyreason, to adjust the hook units withrespect to each other or to the line of, stitching. the'adlustment maybe very simply effected by loosening and subsequently tightening thescrews 45 and 48, which retain the hook frame, and the set-screws 50,which retain the gears 40 in proper relation on the shaft 35. It is notnecessary to disconnect, or-disturb deliver the lubricant tothe hookframes. y

While an illustrativeformrof vthe invention has A portion of this 'beendescribed in considerable detail, it will be i understood that numerousvariations may be.

made in the construction and arrangement' of the several parts withoutdeparting from the general -principles and scope of the invention. The

terms and expressions used herein have been employed as terms ofdescriptionA and -not of limitation.

l. A lockstick sewing machine having a base with a work supportingsurface,.a standard rising Afrom one end of said base, a rotary hookunit ponent for oscillating said rock-shaft, a lubricant reservoirspaced from said hook unit and disposed above the level thereof, meansfor delivering lubricant from said reservoir to said hook unit and fordirecting the lubricant so delivered to said bearings for said shaft, tosaid raceway and to said rock-shaft and the operating connectionstherefor.

shaft, bearing means for said shaft, a lubricant i reservoir carried bysaid standard above said work support, a -conduit extending from saidreservoir to said hook for delivering oil to a surface on said rotarycomponent, said surface being so constructed and arranged as to inducea. pumping action upon'the oil to force it into said raceway,

means forming an annular lubricant collecting pocket extending aboutsaid surface, and means for delivering lubricant from said pocket in onedirection to said raceway and in anotherdirection 'to said bearing meansfor said shaft.

2. AA lockstitch sewing machine having a base with a. work supportingsurface, a standard rising from one end of said base, a, rotary hookunit mounted in said base with 'its axis normal to said work supportingsurface, said hook unit having a rotary component and astationarycomponent with a, raceway therebetween,= said rotary component includingan axially extending driving shaft, bearing means for said shaft, alubricantreservoir carried by said standard above said work support, aconduit extending from said reservoir to said hook for delivering'oil toa surface on said rotary component, said surface being so constructedand arranged as to induce a pumping action upon the oil to force it intosaid raceway, means forming an annular lubricant collecting pocketextending about said surface, and means responsive to the condition ofrest or rotation of said rotary component for delivering lubricant fromsaid pocket alternately to ,said raceway and- -to said bearing means forsaid shaft.`

3. In a lockstitch sewing machine having a base 4frame, a rotarycomponent including a shaft having its axis normal to said work supportand a stationary component, upper and lower bearings in said framevforsaid shaft, said rotary and sta-V tionary components having ahorizontally disposed raceway therebetween, escapement means arranged toengage said stationary component during each cycle of the machine, saidescapement means including a rock-shaft journaled in,

said frame, connections from said rotary comwith a. work support, arotary hook unit having' a 4. In a sewing machine a vertical axis rotaryhook, said hook comprising a rotary component including a shaft and astationary` component having a rib in bearing engagement with a racewayin'said rotary component, a bearing for said shaft, a main lubricantreservoir disposed at a point remote from said rotary hook, andlubricant conducting means for delivering lubricant from said reservoirto a surface at the periphery of said rotary component, the constructionand arrangement being such as to provide passages through which thelubricant so delivered to said surface will be discharged therefromalternately to said raceway upon rotation of said rotary component andtosaid bearing when said component is at rest.

5. In a sewing machine, a vertical axis rotary hook comprising rotaryand stationary components, a shaft adapted to support and actuate saidrotary component, a. bracket in` which said shaft is journaled, alubricant-containing recess in the lower end' of said bracket into whichsaid .shaft extends, escapement means cooperating with said stationarycomponent, actuating means for said escapement-means housed in saidrecess and connected with said shaft, the connection between said shaftand said actuating means comprising an eccentric at the lower end ofsaid shaft wholly 'within the projection of the periphery of said shaft,said actuating means including a part having an axially sliding fit withrespect to said eccentric so as to permit removal and replace- .ment ofsaid shaft from above with consequent engagement and disengagement ofsaid connecwith said stationary component, actuating means forsaidescapement means housed in said recess and connected with saidshaft, the connection between said shaft and said actuating meanscomprising an eccentric at the lower end of said shaft Wholly within theprojection of the periphery of said shaft, said actuating meansincluding a part having an axially sliding t with respect to saideccentric so that engagement and disengagement thereof may be eiected bya simple upward axial sliding movement of said shaft. A l GEORGE SAUER.

